Volume 8, Book 73, Number 87:
Narrated Abu Bakra:
A man was mentioned before the Prophet and another man praised him greatly The Prophet said,
“May Allah’s Mercy be on you ! You have cut the neck of your friend.” The Prophet repeated this sen –
tence many times and said, “If it is indispensable for anyone of you to praise someone, then he should
say, ‘I think that he is so-and-so,” if he really thinks that he is such. Allah is the One Who will take
his accounts (as He knows his reality) and no-one can sanctify anybody before Allah.” (Khalid said,
“Woe to you,” instead of “Allah’s Mercy be on you.”)